Razberry stops working after few seconds from boot

[qbawawa]

I have problem that my razberry stop working after few seconds after system boot. In log there is:

[2015-11-11 08:08:10.226] [D] [zway] SENDING: ( 01 03 00 07 FB )
[2015-11-11 08:08:10.227] [E] [zway] RECEIVED UNKNOWN PACKET TYPE: 0x05
[2015-11-11 08:08:10.228] [E] [zway] RECEIVED UNKNOWN PACKET TYPE: 0x04
[2015-11-11 08:08:10.229] [E] [zway] RECEIVED UNKNOWN PACKET TYPE: 0xcf
[2015-11-11 08:08:10.229] [E] [zway] RECEIVED UNKNOWN PACKET TYPE: 0x67
[2015-11-11 08:08:10.230] [E] [zway] RECEIVED UNKNOWN PACKET TYPE: 0x00
[2015-11-11 08:08:10.231] [E] [zway] RECEIVED UNKNOWN PACKET TYPE: 0x00
[2015-11-11 08:08:10.231] [E] [zway] RECEIVED UNKNOWN PACKET TYPE: 0x00
[2015-11-11 08:08:10.231] [E] [zway] RECEIVED UNKNOWN PACKET TYPE: 0x49
[2015-11-11 08:08:10.328] [E] [zway] RECEIVED UNKNOWN PACKET TYPE: 0x2b
[2015-11-11 08:08:10.329] [E] [zway] RECEIVED UNKNOWN PACKET TYPE: 0x00
[2015-11-11 08:08:10.329] [E] [zway] RECEIVED UNKNOWN PACKET TYPE: 0x00
[2015-11-11 08:08:10.329] [W] [zway] Received SOF, while awaiting ACK
[2015-11-11 08:08:10.332] [C] [i/o] Serial port has gone: (null)
[2015-11-11 08:08:10.332] [E] [zway] Device processing interrupted
[2015-11-11 08:08:10.332] [D] [zway] Worker thread exit point
[2015-11-11 08:08:10.337] [D] [zway] Worker thread successfully finished
[2015-11-11 08:08:10.339] [E] [zway] SaveData will not save data since it wasn't loaded. This is to prevent data loss.
[2015-11-11 08:08:10.340] [C] [zway] Get Serial API Capabilities returned zero.
[2015-11-11 08:08:10.358] [core] Notification: critical (z-wave): Cannot start Z-Wave binding: Error: Bad data - communication failed

What can be wrong?

[PoltoS]

sure there is no other instances of Z-Way (or other processes using the same port) running?

[2015-11-11 08:08:10.332] [C] [i/o] Serial port has gone: (null)